support/mph.h

   1 /*
   2  * Common/shared macros and routines.
   3  *
   4  * This file contains macros of the form
   5  *
   6  *   mph_return_if_TYPE_overflow(val);
   7  *
   8  * Which tests `val' for a TYPE underflow/overflow (that is, is `val' within
   9  * the range for TYPE?).  If `val' can't fit in TYPE, errno is set to
  10  * EOVERFLOW, and `return -1' is executed (which is why it's a macro).
  11  *
  12  * Assumptions:
  13  *
  14  * I'm working from GLibc, so that's the basis for my assumptions.  They may
  15  * not be completely portable, in which case I'll need to fix my assumptions.
  16  * :-(
  17  *
  18  * See the typedefs for type size assumptions.  These typedefs *must* be kept
  19  * in sync with the types used in Mono.Posix.dll.
  20  *
  21  * See also:
  22  *   http://developer.apple.com/documentation/Darwin/Reference/ManPages/
  23  */
  24
  25 #ifndef INC_mph_H
  26 #define INC_mph_H
  27
  28 #include <config.h>
  29
  30 #include <stddef.h>             /* offsetof */
  31 #include <limits.h>             /* LONG_MAX, ULONG_MAX */
  32 #include <errno.h>              /* for ERANGE */
  33 #include <glib.h>               /* for g* types, etc. */
  34
  35 #ifdef HAVE_STDINT_H
  36 #include <stdint.h>             /* for SIZE_MAX */
  37 #endif
  38
  39 #if __APPLE__ || __BSD__ || __FreeBSD__
  40 #define MPH_ON_BSD
  41 #endif
  42
  43 #ifdef HAVE_VISIBILITY_HIDDEN
  44 #define MPH_INTERNAL __attribute__((visibility("hidden")))
  45 #else
  46 #define MPH_INTERNAL
  47 #endif
  48
  49 #if defined (HOST_WIN32) && !defined (EOVERFLOW)
  50 #define EOVERFLOW 75
  51 #endif /* def HOST_WIN32 && ndef EOVERFLOW */
  52
  53 #if !defined (HOST_WIN32)
  54
  55 /*
  56  * Solaris doesn't define these BSD values, and if they're not present then
  57  * map.c:Mono_Posix_FromSeekFlags() breaks badly; see:
  58  * http://bugzilla.gnome.org/show_bug.cgi?id=370081
  59  */
  60
  61 #ifndef L_SET
  62 #define L_SET SEEK_SET
  63 #endif /* ndef L_SET */
  64
  65 #ifndef L_INCR
  66 #define L_INCR SEEK_CUR
  67 #endif /* ndef L_INCR */
  68
  69 #ifndef L_XTND
  70 #define L_XTND SEEK_END
  71 #endif /* ndef L_XTND */
  72
  73 /*
  74  * XATTR_AUTO is a synonym for 0 within XattrFlags, but most systems don't
  75  * define it.  map.c doesn't know that, though, so we ensure that it's defined
  76  * so that the value 0 round-trips through MonoPosixHelper.
  77  */
  78
  79 #ifndef XATTR_AUTO
  80 #define XATTR_AUTO 0
  81 #endif /* ndef XATTR_AUTO */
  82
  83 #endif /* ndef HOST_WIN32 */
  84
  85 typedef    gint64 mph_blkcnt_t;
  86 typedef    gint64 mph_blksize_t;
  87 typedef   guint64 mph_dev_t;
  88 typedef   guint64 mph_ino_t;
  89 typedef   guint64 mph_nlink_t;
  90 typedef    gint64 mph_off_t;
  91 typedef   guint64 mph_size_t;
  92 typedef    gint64 mph_ssize_t;
  93 typedef    gint32 mph_pid_t;
  94 typedef   guint32 mph_gid_t;
  95 typedef   guint32 mph_uid_t;
  96 typedef    gint64 mph_time_t;
  97 typedef    gint64 mph_clock_t;
  98 typedef   guint64 mph_fsblkcnt_t;
  99 typedef   guint64 mph_fsfilcnt_t;
 100
 101 /* Some versions of OS X don't define these typedefs, needed by map.c */
 102 #ifndef HAVE_BLKCNT_T
 103 typedef mph_blkcnt_t blkcnt_t;
 104 #endif
 105
 106 #ifndef HAVE_BLKSIZE_T
 107 typedef mph_blksize_t blksize_t;
 108 #endif
 109
 110 #ifndef HAVE_SUSECONDS_T
 111 typedef gint64 suseconds_t;
 112 #endif
 113
 114 #ifdef HAVE_LARGE_FILE_SUPPORT
 115 #define MPH_OFF_T_MAX G_MAXINT64
 116 #define MPH_OFF_T_MIN G_MININT64
 117 #else
 118 #define MPH_OFF_T_MAX G_MAXINT32
 119 #define MPH_OFF_T_MIN G_MININT32
 120 #endif
 121
 122 #ifdef SIZE_MAX
 123 #define MPH_SIZE_T_MAX SIZE_MAX
 124 #elif SIZEOF_SIZE_T == 8
 125 #define MPH_SIZE_T_MAX  G_MAXUINT64
 126 #elif SIZEOF_SIZE_T == 4
 127 #define MPH_SIZE_T_MAX  G_MAXUINT32
 128 #else
 129 #error "sizeof(size_t) is unknown!"
 130 #endif
 131
 132 #define _mph_return_val_if_cb_(val, ret, cb) G_STMT_START{ \
 133         if (cb (val)) { \
 134                 errno = EOVERFLOW; \
 135                 return ret; \
 136         }}G_STMT_END
 137
 138 #define mph_have_long_overflow(var) ((var) > LONG_MAX || (var) < LONG_MIN)
 139
 140 #define mph_return_val_if_long_overflow(var, ret) \
 141         _mph_return_val_if_cb_(var, ret, mph_have_long_overflow)
 142
 143 #define mph_return_if_long_overflow(var) mph_return_val_if_long_overflow(var, -1)
 144
 145 #define mph_have_ulong_overflow(var) ((var) > ULONG_MAX)
 146
 147 #define mph_return_val_if_ulong_overflow(var, ret) \
 148         _mph_return_val_if_cb_(var, ret, mph_have_ulong_overflow)
 149
 150 #define mph_return_if_ulong_overflow(var) mph_return_val_if_ulong_overflow(var, -1)
 151
 152 #define mph_have_size_t_overflow(var) ((var) > MPH_SIZE_T_MAX)
 153
 154 #define mph_return_val_if_size_t_overflow(var, ret) \
 155         _mph_return_val_if_cb_(var, ret, mph_have_size_t_overflow)
 156
 157 #define mph_return_val_if_ssize_t_overflow(var, ret) \
 158         _mph_return_val_if_cb_(var, ret, mph_have_long_overflow)
 159
 160 #define mph_return_if_size_t_overflow(var) mph_return_val_if_size_t_overflow(var, -1)
 161
 162 #define mph_return_if_ssize_t_overflow(var) mph_return_val_if_ssize_t_overflow(var, -1)
 163
 164 #define mph_have_off_t_overflow(var) \
 165         (((var) < MPH_OFF_T_MIN) || ((var) > MPH_OFF_T_MAX))
 166
 167 #define mph_return_val_if_off_t_overflow(var, ret) \
 168         _mph_return_val_if_cb_(var, ret, mph_have_off_t_overflow)
 169
 170 #define mph_return_if_off_t_overflow(var) mph_return_val_if_size_t_overflow(var, -1)
 171
 172 #define mph_return_if_time_t_overflow(var) mph_return_if_long_overflow(var)
 173
 174 #define mph_return_if_val_in_list5(var,a,b,c,d,e) \
 175         do {                                                            \
 176                 int v = (var);                                                \
 177                 if (v == a || v == b || v == c || v == d || v == e)           \
 178                         return -1;                                                  \
 179         } while (0)
 180
 181 /*
 182  * Helper function for functions which use ERANGE (such as getpwnam_r and
 183  * getgrnam_r).  These functions accept buffers which are dynamically
 184  * allocated so that they're only as large as necessary.  However, Linux and
 185  * Mac OS X differ on how to signal an error value.
 186  *
 187  * Linux returns the error value directly, while Mac OS X is more traditional,
 188  * returning -1 and setting errno accordingly.
 189  *
 190  * Unify the checking in one place.
 191  */
 192 static inline int
 193 recheck_range (int ret)
 194 {
 195         if (ret == ERANGE)
 196                 return 1;
 197         if (ret == -1)
 198                 return errno == ERANGE;
 199         return 0;
 200 }
 201
 202 typedef unsigned int mph_string_offset_t;
 203
 204 enum {
 205         MPH_STRING_OFFSET_PTR   = 0x0,
 206         MPH_STRING_OFFSET_ARRAY = 0x1,
 207         MPH_STRING_OFFSET_MASK  = 0x1
 208 };
 209
 210 #define MPH_STRING_OFFSET(type,member,kind) ((offsetof(type,member) << 1) | kind)
 211
 212 MPH_INTERNAL char*
 213 _mph_copy_structure_strings (
 214         void *to,         const mph_string_offset_t *to_offsets,
 215         const void *from, const mph_string_offset_t *from_offsets,
 216         size_t num_strings);
 217
 218 #endif /* ndef INC_mph_H */
 219
 220 /*
 221  * vim: noexpandtab
 222  */